Sp-2Cl-cAMPS bound to PKAR CBD2

Experimental Data Snapshot

  • Resolution: 2.40 Å
  • R-Value Free: 0.307 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.254 

wwPDB Validation   3D Report Full Report

Ligand Structure Quality Assessment 

This is version 1.6 of the entry. See complete history


Disrupting the Allosteric Interaction between the Plasmodium falciparum cAMP-dependent Kinase and Its Regulatory Subunit.

Littler, D.R.Bullen, H.E.Harvey, K.L.Beddoe, T.Crabb, B.S.Rossjohn, J.Gilson, P.R.

(2016) J Biol Chem 291: 25375-25386

  • DOI: https://doi.org/10.1074/jbc.M116.750174
  • Primary Citation of Related Structures:  
    5K8S, 5KBF, 5T3N

  • PubMed Abstract: 

    The ubiquitous second messenger cAMP mediates signal transduction processes in the malarial parasite that regulate host erythrocyte invasion and the proliferation of merozoites. In Plasmodium falciparum, the central receptor for cAMP is the single regulatory subunit (R) of protein kinase A (PKA). To aid the development of compounds that can selectively dysregulate parasite PKA signaling, we solved the structure of the PKA regulatory subunit in complex with cAMP and a related analogue that displays antimalarial activity, (S p )-2-Cl-cAMPS. Prior to signaling, PKA-R holds the kinase's catalytic subunit (C) in an inactive state by exerting an allosteric inhibitory effect. When two cAMP molecules bind to PKA-R, they stabilize a structural conformation that facilitates its dissociation, freeing PKA-C to phosphorylate downstream substrates such as apical membrane antigen 1. Although PKA activity was known to be necessary for erythrocytic proliferation, we show that uncontrolled induction of PKA activity using membrane-permeable agonists is equally disruptive to growth.

  • Organizational Affiliation

    From the Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, and.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
cAMP-dependent protein kinase regulatory subunit
A, B
161Plasmodium falciparum 3D7Mutation(s): 0 
Gene Names: PKArPF3D7_1223100PFL1110c
Find proteins for Q7KQK0 (Plasmodium falciparum (isolate 3D7))
Explore Q7KQK0 
Go to UniProtKB:  Q7KQK0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7KQK0
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.40 Å
  • R-Value Free: 0.307 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.254 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 64.19α = 90
b = 64.19β = 90
c = 195.71γ = 90
Software Package:
Software NamePurpose
iMOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report

Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Health and Medical Research Council (NHMRC, Australia)Australia--

Revision History  (Full details and data files)

  • Version 1.0: 2016-10-12
    Type: Initial release
  • Version 1.1: 2016-10-19
    Changes: Data collection
  • Version 1.2: 2016-11-02
    Changes: Database references
  • Version 1.3: 2016-12-14
    Changes: Database references
  • Version 1.4: 2017-09-20
    Changes: Author supporting evidence, Data collection
  • Version 1.5: 2020-01-08
    Changes: Author supporting evidence
  • Version 1.6: 2023-10-04
    Changes: Data collection, Database references, Refinement description, Structure summary